1 files changed, 44 insertions, 0 deletions
diff --git a/src/common_audio/signal_processing_library/main/source/get_size_in_bits.c b/src/common_audio/signal_processing_library/main/source/get_size_in_bits.c
new file mode 100644
index 0000000000..53853f0531
--- /dev/null
+++ b/src/common_audio/signal_processing_library/main/source/get_size_in_bits.c
@@ -0,0 +1,44 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_GetSizeInBits().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "signal_processing_library.h"
+
+#ifndef SPL_NO_DOUBLE_IMPLEMENTATIONS
+
+WebRtc_Word16 WebRtcSpl_GetSizeInBits(WebRtc_UWord32 value)
+{
+
+    int bits = 0;
+
+    // Fast binary search to find the number of bits used
+    if ((0xFFFF0000 & value))
+        bits = 16;
+    if ((0x0000FF00 & (value >> bits)))
+        bits += 8;
+    if ((0x000000F0 & (value >> bits)))
+        bits += 4;
+    if ((0x0000000C & (value >> bits)))
+        bits += 2;
+    if ((0x00000002 & (value >> bits)))
+        bits += 1;
+    if ((0x00000001 & (value >> bits)))
+        bits += 1;
+
+    return bits;
+}
+
+#endif